Improvement in rubber-coated bags



- STATES PATENT OFFICE.

jWiLnLgrMA .1); enLMsHAW, or EooKY EiLnnEW JERSEY..

.-|MPRovEMEN,-r l|N- RUBBER-COATED BAGS.

,Speconfqhlling Part of Letters Patent No.1160q87, dated March 16, 1875; application filed v 1 l Janna-ry 25, 1875 l Beit Vknown that I, :'.VIIQLuIiiiy/Ilv ADEAKIN GRIM'SHAW, of RockyfHll, in thef-county of ventedcertaiu new and usefulInlprovements in Rubber-Coated Bags; and I do l-'ereby de. c lare that the following is a full, clear', and

exact description thereof, which `will enable others skilled'in thearttowhich it pertains toni-alie and` use theA saline,- reference being. had to the accompanying drawings, and to4 the letters of 'reference'- marked the'n, rwhich form a' Part Of'hiS Specification "'Iheinvention herein relates to bags ren-v ,tiered Water and acid proof by. coating: the materialwith acomposition in whichfcrude india-rubber fcrmsthe chief element. i

yAsl have filed an al'iplication,fOr'a'patent for a new compositionas a"`coatin `gi for bags for' the. purpose stated,"it is .deemed unnecessary to describe in this '.pfaten't 'such vcoating..'co1'n pound,-. in connection with the `imt proved way in which the beg isx'nade, further than to state that the material is -coated in* any of the Ways l"uow'in vuse forwa'ter'proofing fabrics'. n f

A The specific invention'herein' consists .ofa bag or carrying-pac'kagel coatedwith rubber,

and h'avingits edgesunited Vby the coated' surface, by 'whiclrthe lapped parts are reu.-V

, dered' homogeneous with the body ofthe bag, i as a. new article -of manufacture; the object` and advantage of which are to utilizethe 'means which renders the -bag 'water-proof,

as the element for completing Sits lformation 'n effecting thm-homogeneous union of its seams without-further,labor, time, and expense in themanufacture of; the bag, las will be more fullyfherein specified.v

The accompanying drawings' representithe. `bag-pattern and ,the pattern folded with its,

coated edges lapped. inf'the' way the seam is',

made integralwith the coated bag; i jllhe-coated-'Water-proof material `is cut into properlengths, with half ofthe bottom edge,

as at ql, cut away the twidth of the'int'ended lap to allow the remaining half b to be 'turned -iver' to form the scam. that when the bottom lap b is made o'rie side will lap-with the other-and form the rside of the uncoated surface of the lapped portions joins the coated side when the bag is only Somerset-and' State of- New Jersey, haveina come impregnated with the rodorless bag. 'i

It is vso doubled coated on one side, The lapped portions are will besuch as to render the union of the lapped parts as solid and rm as any part of the coated surface. I prefer for this pur- ,pose ahand-iron of two rollers weighing about thirty pounds, which can be readily 'passed over the seams by an operator. The y bagsare then put into a box prepared for the pupose,-oue upon the' other, and placed in a 'steam-chamber, where they are submitted to the curing or vulcanizing action of steam un` der'pressure of about thirty pounds, where they remain for about two h'ours, when they are removed, separated, and cooled. t It is important, in connection with vulcan- 'izing the coated bags, to also deodorize them,

so -that they can be -used forany purpose desired,- and. especially for sugar-packages, or such" other articles as would be liable to beodor of the com- "position coating.

For this purpose I employ leaf mint, placed .amongand between the bagsin the curingchamber, so that the heatA from the moist steaml seizesnpou the'mint leaves, and, impregnating them, produces an evaporation from the/leaves, whichpermeatesthe 4bags and changes the odor o f the gum, giving an agreeable and pleasant'smell. This eect is, however, produced by therapid neutralization `-of thel gases. arising from the vulcanizing- 'processf-by the employment, in connection with the mint leaves, of copperas, which dis infects the curing compartment and allows,` the aroma from the mint to take the; placeof' the bad 'odor f the'gum.

By this process I produce a new article of manufacture, being a'water and acid proof It is-obvious that `the bag may be coated on its inner orV outer, or both, surfaces, as may be desired.

A paper bag vmaybe made in the sane way.'

A water-proof bag coated with rubber, and have affixed my signature 'in presence of two having its edges mt, lapped, and united by. witnesses. l the coated surface y which the lapped parts'I v are rendered homogeneousv with the body of A WILLIAM D' GRI'MSHAW the bag, as a newr article of manufacture, as Witnesses: herein described. A`..E. H. JOHNSON,

In testmomT that I claim the foregoingl I J, W. HAMILTON JOHNSON. 

